Lesson 2.4.1

2.4.1 Newton's third law and momentum Quiz: Pearson Edexcel Physics, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 2.4.1, Newton's third law and momentum: 20 multiple choice questions for the Pearson Edexcel Physics (9PH0), Unit 2: Mechanics, written with Revision Ninja.

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The 20 questions

  1. Body A exerts a force on body B. What force does body B exert on body A?

    • Equal and opposite
    • Equal and same-direction
    • Smaller and opposite
    • Greater and opposite

  2. Do Newton's third law force pairs act on the same body or on different bodies?

    • The faster body
    • The same body
    • Different bodies
    • The larger body

  3. Momentum is defined as:

    • p = mv
    • p = m/v
    • p = (1/2)mv^2
    • p = mv^2

  4. Which statement correctly describes momentum as a physical quantity?

    • Vector quantity
    • Scalar quantity
    • Dimensionless quantity
    • Base quantity

  5. What is the momentum of a 0.2 kg ball moving at 5 m s^-1?

    • 2.5 kg m s^-1
    • 1.0 kg m s^-1
    • 25 kg m s^-1
    • 0.04 kg m s^-1

  6. A 1500 kg car travels at 20 m s^-1 due west. What is its momentum?

    • 75 kg m s^-1 west
    • 3.0 x 10^4 kg m s^-1 west
    • 3.0 x 10^4 kg m s^-2 west
    • 3.0 x 10^4 kg m s^-1 east

  7. A 2.0 kg gun recoils after firing a 0.010 kg bullet at 400 m s^-1. What is the recoil velocity of the gun?

    • 200 m s^-1 backwards
    • 0.02 m s^-1 backwards
    • 4.0 m s^-1 backwards
    • 2.0 m s^-1 backwards

  8. A 0.15 kg ball is thrown at 20 m s^-1 and bounces straight back at 15 m s^-1. What is the change in its momentum?

    • 5.3 kg m s^-1
    • 3.0 kg m s^-1
    • 0.75 kg m s^-1
    • 7.5 kg m s^-1

  9. The ball in the previous scenario is in contact with a wall for 0.050 s. What is the average force from the wall on it?

    • 0.26 N
    • 105 N
    • 5.25 N
    • 1050 N

  10. Body A exerts a 12 N force east on body B. What force does body B exert on body A?

    • 12 N west
    • 12 N east
    • 24 N west
    • 0 N

  11. A 2.0 kg body moves at 3.0 m s^-1 east and a 4.0 kg body moves at 1.0 m s^-1 west. What is their total momentum?

    • 2.0 kg m s^-1 west
    • 2.0 kg m s^-1 east
    • 14 kg m s^-1 west
    • 10 kg m s^-1 east

  12. Why do Newton's third law force pairs not cancel out on a single object?

    • On same body
    • On different bodies
    • Unequal magnitudes
    • They cancel out

  13. A car and a lorry collide. Why does the lorry experience a smaller acceleration than the car?

    • Lower lorry speed
    • Greater car mass
    • Greater lorry mass
    • Smaller lorry force

  14. An apple of weight 0.2 N falls to the ground under gravity. What force does the apple exert on the Earth?

    • 9.8 N upwards
    • 0.2 N upwards
    • 0.2 N downwards
    • 0 N

  15. A 0.40 kg hockey puck moves at 15 m s^-1 north. What is its momentum?

    • 6.0 kg m s^-1 south
    • 6.0 kg m s^-1 north
    • 0.38 kg m s^-1 north
    • 15.4 kg m s^-1 north

  16. Two objects have a total momentum of zero. How do their individual momenta compare?

    • Both are zero
    • Equal and opposite
    • Equal and same-direction
    • One is doubled

  17. A rocket pushes exhaust gas backwards. What force propels the rocket forwards?

    • Atmosphere pushing gas
    • Gravity pushing rocket
    • Gas pushing rocket
    • Air pushing rocket

  18. A person pushes a wall with 50 N north. What force does the wall exert on the person?

    • 0 N
    • 50 N south
    • 100 N south
    • 50 N north

  19. A 1.0 kg trolley moves at 2.0 m s^-1 east. What is its momentum, and what is the direction of the momentum?

    • 1.0 kg m s^-1 east
    • 0.5 kg m s^-1 east
    • 2.0 kg m s^-1 east
    • 2.0 kg m s^-1 west

  20. Two objects have equal and opposite momenta. What is the total momentum of the two-object system?

    • Product of masses
    • Double one momentum
    • Zero
    • Infinite

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